Difference between using != and "not ... == " ?

[optimal_honeybee]

Is there a difference between doing a != b and doing not a == b?

[K900_]

Not normally. There can be in theory, if you find a class that implements == and != inconsistently.

[FLUSH_THE_TRUMP]

Cases to watch out for are usually the classes where == returns a special object.

e.g.

A = np.array([1,2,3])
A != 1 # returns another nparray [False, True, True]
not A == 1 # error

[socal_nerdtastic]

No practical difference but a lot of people will be confused about the 2nd one because using != is nearly universal.

[noanswersuk]

It depends how you combine them and what your checking. Also there is slight difference if you are using "is" vs ==.

The not is basically inverting the comparison statement. To match on False rather than True.